1 package edu.berkeley.sbp.misc;
2 import edu.berkeley.sbp.*;
3 import edu.berkeley.sbp.util.*;
6 import java.lang.reflect.*;
8 public class ReflectiveWalker extends StringWalker {
9 public ReflectiveWalker() { this.target = this; }
10 public ReflectiveWalker(Object target) { this.target = target; }
11 private final Object target;
12 private String normalize(String s) {
13 StringBuffer ret = new StringBuffer();
14 for(int i=0; i<s.length(); i++) {
16 if (i==0 && c >= '0' && c <= '9') { ret.append('_'); ret.append(c); continue; }
18 case ' ': ret.append("_space_"); break;
19 case '~': ret.append("_tilde_"); break;
20 case ';': ret.append("_semicolon_"); break;
21 case '=': ret.append("_equals_"); break;
22 case '-': ret.append("_minus_"); break;
23 case ')': ret.append("_rightparen_"); break;
24 case '(': ret.append("_leftparen_"); break;
25 case '!': ret.append("_bang_"); break;
26 case '`': ret.append("_backtick_"); break;
27 case '\"': ret.append("_quotes_"); break;
28 case '\'': ret.append("_quote_"); break;
29 case ',': ret.append("_comma_"); break;
30 case '.': ret.append("_dot_"); break;
31 case '>': ret.append("_greater_"); break;
32 case '<': ret.append("_less_"); break;
33 case '&': ret.append("_amp_"); break;
34 case '@': ret.append("_at_"); break;
35 case '#': ret.append("_hash_"); break;
36 case '|': ret.append("_pipe_"); break;
37 case '^': ret.append("_caret_"); break;
38 case '%': ret.append("_percent_"); break;
39 case '$': ret.append("_dollar_"); break;
40 case ':': ret.append("_colon_"); break;
41 case '?': ret.append("_question_"); break;
42 case '/': ret.append("_slash_"); break;
43 case '\\': ret.append("_backslash_"); break;
44 case '*': ret.append("_star_"); break;
45 case '+': ret.append("_plus_"); break;
46 case '_': ret.append("_underscore_"); break;
47 case '[': ret.append("_leftbracket_"); break;
48 case ']': ret.append("_rightbracket_"); break;
49 case '{': ret.append("_leftbrace_"); break;
50 case '}': ret.append("_rightbrace_"); break;
51 default: ret.append(c); break;
54 return ret.toString();
56 public Object walk(String tag, Object[] argo) {
57 if (argo.length==0) return super.walk(tag, argo);
58 if (argo==null) return tag;
59 if (tag==null || "".equals(tag)) return argo;
60 Member m = member(normalize(tag), argo.length);
61 //System.out.println("preparing to invoke method " + (m==null ? "null" : (m.toString())) + " for sequence " + (owner()+"."+tag));
62 if (m != null) return Reflection.fuzzyInvoke(target, m, argo);
63 if (argo.length==0) return null;
64 if (argo.length==1) return argo[0];
65 Class c = argo[0].getClass();
66 for(Object o : argo) c = Reflection.lub(c, o.getClass());
67 Object[] ret = Reflection.newArray(c, argo.length);
68 System.arraycopy(argo, 0, ret, 0, argo.length);
72 public Member member(String methodName, int nonVoid) {
73 Class target = this.target.getClass();
74 if (methodName == null || methodName.equals("")) return null;
76 for (Method m : target.getMethods()) {
77 if (!m.getName().equals(methodName)) continue;
78 if (m.getParameterTypes().length != nonVoid) continue;
79 if (ret != null) throw new Error("two methods with " + nonVoid + " parameters: " + target.getName() + "." + methodName);
82 if (ret != null) return ret;
85 Class c = Reflection.forNameOrNull(t.getName() + "$" + methodName);
87 for (Constructor m : c.getConstructors()) {
88 if (m.getParameterTypes().length != nonVoid) continue;
89 if (ret != null) throw new Error("two constructors with " + nonVoid + " parameters: " + c.getName() + ".<init>()");
92 if (ret != null) return ret;
94 t = t.getSuperclass();
96 if (ret != null) return ret;
97 throw new Error("while computing return type of " +methodName+ " could not find method with name " + methodName +
98 " and " + nonVoid + " arguments");